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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b62dee7d6a4c07628dd7dcd321fdb381593d6a47b4599b917f23fa9256315bf' 
  AND token = '5aUDWO69iYlDJ62Q1Hp5U6W2nGXJYLqq95Qb0kL+OEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}